Where can I find the hardware to attach the spare tire to the side of the rear compartment for a 1989 Cherokee? firstname.lastname@example.org
you can find them at your local junkyards.
This hardware may still be available from Jeep, but the easiest place would be to check a junkyard in your area. As far as stereos, I recommend installing an aftermarket stereo. The factory stereo on my parents' 1992 Cherokee started eating cassette tapes and having other issues around 5 years after purchase. My sister installed an aftermarket CD player when she took the car with her to college and it was a much more economical option than replacing the MOPAR unit. Factory stereos are still available rebuilt on exchange from the dealership, but for the price you pay, you could easily have an aftermarket unit installed for less money.
you can also get them from jeep4x4center.com they have all sorts of stuff.
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